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King Neptune's Royal Crown appears in the SpongeBob SquarePants Movie. It appears to be very valuable. It signifies who the ruler of the sea is and also hides King Neptune's bald spot. Once it was stolen by Plankton, he tried to hide his bald spot with a paper bag.

King Neptune is a mean, magical, and harsh ruler who goes as far as to punish his servants up to 20 years in the dungeon for their wrong doings. However, it appears that his whole world besides being king of the aquatic underworld is his family.

Neptune is shown not only to be a strict ruler, but also a strict father, especially to his son, Triton. He tries to make him practice smiting, but Triton was interested in mortal affairs as a child, such as the ball-and-stick game (Triton's nickname for baseball) and even making a cure for mortal diseases. As a result, Neptune locked him away for 1,000 years until Triton becomes a proper god. It turns out it was both a success and a disaster after Triton destroyed Bikini Bottom as revenge on his father. Neptune was proud that he used his god powers and hugged him. Neptune has other problems with his daughter, Mindy. He thinks being cruel to people (especially mortals) is what a king needs to be, but Mindy thinks kindness is a better option. He ends up getting mad at her, but at the end of the movie, he learns his lesson. Neptune loves both Mindy and Triton with all his heart, and he would never let anything bad happen to them (except if he has a good reason).

King Neptune invites invites SpongeBob SquarePants and Patrick Star to the Poseidome to f
ace off against the game's first boss: Robo-Sandy. SpongeBob goes first and deals a great damage to the robot before Patrick takes over and finally SpongeBob makes a final strike, finishing off Robo Sandy.

King Neptune appears in a somewhat antagonistic role, and a redesign. King Neptune's crown has been stolen by Plankton and SpongeBob and Patrick must retrieve it from where Plankton sold it to: Shell City. King Neptune blames Mr. Krabs for the theft and freezes him in ice, within the Krusty Krab. His daughter Princess Mindy also aids the heroes in their journey. Later the crown is returned, but Plankton brainwashes Neptune into attacking the heroes. After his defeat he is free and Plankton is sent to jail

A storm current has disrupted a shipment of undergarments of Neptune's underwear, spreading them
across the ocean floor. Neptune calls upon his subjects to find his lost undergarments, witha reward to those who collect the most underwear.

Prince Triton has captured his father Neptune and mother Queen Amphitrite within the Krusty Krab and is using Neptune's advisors as his minions to take over eatch level of Bikini Bottom morphing it into Mt. Triton. King Neptune and Queen Ampphitrite's tridents allows SpongeBob and Patrick into having god-like powers and rescuing those captured at the Krusty Krab. After his son's defeat, Neptune forgives him and is proud that he used his powers. They hugged and return to Atlantis.